INCOME TAXES - Loss Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
INCOME TAXES
United States	$ (27,671)	$ (32,980)	$ 144
Mainland China and Hong Kong	(18,200)	(5,089)	(26,436)
Loss before income tax benefit and share of net loss in an equity investee	$ (45,871)	$ (38,069)	$ (26,292)

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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+ Details